59 lines
1.4 KiB
C++
59 lines
1.4 KiB
C++
|
// Copyright (c) 2014-2021 Dr. Colin Hirsch and Daniel Frey
|
||
|
|
// Distributed under the Boost Software License, Version 1.0.
|
||
|
|
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
|
||
|
|
|
||
|
|
#ifndef TAO_PEGTL_INTERNAL_OPT_HPP
|
||
|
|
#define TAO_PEGTL_INTERNAL_OPT_HPP
|
||
|
|
|
||
|
|
#include <type_traits>
|
||
|
|
|
||
|
|
#include "../config.hpp"
|
||
|
|
|
||
|
|
#include "enable_control.hpp"
|
||
|
|
#include "seq.hpp"
|
||
|
|
#include "success.hpp"
|
||
|
|
|
||
|
|
#include "../apply_mode.hpp"
|
||
|
|
#include "../rewind_mode.hpp"
|
||
|
|
#include "../type_list.hpp"
|
||
|
|
|
||
|
|
namespace TAO_PEGTL_NAMESPACE::internal
|
||
|
|
{
|
||
|
|
template< typename... Rules >
|
||
|
|
struct opt
|
||
|
|
: opt< seq< Rules... > >
|
||
|
|
{};
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct opt<>
|
||
|
|
: success
|
||
|
|
{};
|
||
|
|
|
||
|
|
template< typename Rule >
|
||
|
|
struct opt< Rule >
|
||
|
|
{
|
||
|
|
using rule_t = opt;
|
||
|
|
using subs_t = type_list< Rule >;
|
||
|
|
|
||
|
|
template< apply_mode A,
|
||
|
|
rewind_mode,
|
||
|
|
template< typename... >
|
||
|
|
class Action,
|
||
|
|
template< typename... >
|
||
|
|
class Control,
|
||
|
|
typename ParseInput,
|
||
|
|
typename... States >
|
||
|
|
[[nodiscard]] static bool match( ParseInput& in, States&&... st )
|
||
|
|
{
|
||
|
|
(void)Control< Rule >::template match< A, rewind_mode::required, Action, Control >( in, st... );
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
template< typename... Rules >
|
||
|
|
inline constexpr bool enable_control< opt< Rules... > > = false;
|
||
|
|
|
||
|
|
} // namespace TAO_PEGTL_NAMESPACE::internal
|
||
|
|
|
||
|
|
#endif
|